bug40155 - PageTriage: Unsupported operand types
bug40155 - PageTriage: Unsupported operand types

This could happen in the following sequence:
1. the api gets a list of page ids
2. the cron removes a page from the queue
3. the api tries to get the data for the list of ids
4. null value instead of an array for the deleted page

Change-Id: If03c43798bdac6a126453e29465a6b6410baad51

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage